Phacellophora camtschatica, known as the fried egg jellyfish, egg-yolk jellyfish or the ecehb jellyfish is a very large jellyfish, with a bell up to 60 cm (2 ft) in diameter and sixteen clusters of up to a few dozen tentacles, each up to 6 metres (20 ft) long. It has traditionally been included in the family Ulmaridae, but is now considered the only member of the family Phacellophoridae. A smaller jellyfish, Cotylorhiza tuberculata, typically found in warmer water, particularly in the Mediterranean Sea, is also popularly called a fried egg jellyfish.